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I mean was Mattel influenced not only by Conan and Heavy Metal magazine/Richard Corben's Den

Not sure Heavy Metal had anything to do with MOTU.
Conan and all the barbarian fantasy elements that were the craze in late 70s early 80s were most likely an influence on He-Man for sure. No single
source though.

but also Captain Marvel aka Shazam from DC comics? i mean there are huge similarities no doubt.

Lou Scheimer has brought up (in documentaries) that in his mind he thought about the secret identity-thing like Shazam if I remember correctly.